Automatic receding sawmill-setworks



(No Model.) I

. A. S. PETTICREW. AUTOMATIC REGEDING SAWMILL SET WORKS.

No. 502,316. Patented Aug. 1, 1 893.

ri g. 5

UNITED STATES PATENT OFFICE.

ALGERNON S. PETTICREW, OF ST. LOUIS, MISSOURI.

AUTOMATIC RECEDING SAWMILL-SETWORKS.

SPECIFICATION forming part of Letters I atent No. 502, 316, dated August 1, 1893. Application filed January 20, 18-91. Renewed July 1, 1893. Serial No. 479,394- (No model.)

To all whom it may concern:

Be it known that I, ALGERNON S. Parr CREW, of the city of St. Louis and State of Missouri, have invented certain new and useful Improvements in Automatic Receding Sawmill-Setworks, of which the following is a full, clear, and exact description, reference being had to 'the accompanying drawings, forming a part hereof. Y

My invention relates to improvements in automatic receding saw-mill set works, and consists in the novel arrangement and combination of parts as will be fully hereinafter described and designated in the claims.

In the drawings:Figure 1, is a top plan view of my completeinvention. Fig. 2 is a vertical section taken on the line w 00 of Fig. 1, showing a volute coil located in the drum for receding the set works. Fig. 3, is a similar section taken on the line y y of Fig. 1, showing the inner gearing of the drum, and Fig. 4 is a vertical section taken on the line 22 of Fig. 1.

Referring to the drawings:1, indicates guide-ways for the knee-blocks, which guideways are made after the usual construction, and are so constructed that the base of the knee-blocks is free to move backward and forward in the same. Said guideways are suitably mounted upon a carriage frame 2.

3, indicates the knee-blocks proper, the bases of which are provided with teeth or cogs which are adapted to mesh with pinions 4 which are secured to the set shaft 5. Said set shaft is suitably and mechanically mounted in the guide-ways 1, and is adapted to freely move in its appropriate bearings therein. When set shaft 5 is rotated or revolved, it imparts its motion to pinions 4 which are rigidly secured to the same, and said pinions impart their motion to the knee-blocks 3.

6,indicates a frame-work in which set shaft 5 also has, its bearings, and said frame-work has an additional function of affording protection for suitable mechanism mounted and partially inclosed in the same.

7, indicates a small bar or shaft which is pivotally secured in frame work 6.

to bar 7 is an adjustable dog 8, which has the function of holding the drum shown and consequently the set works in the desired position. Said dog is adjustable along the length Secured of the bar '7 and is held in a rigid position wherever desired by means of, thumb-screw 9. Likewise secured to said bar 7 is an arm 10. Said arm 10 is adapted'to rest upon a spiral spring 11 which spring is suitably and mechanically mounted in frame work 6. The function of said spring is to hold dog 8 in engagement with the drum as will be more fully hereinafter described.

12 indicates a lever which is free to move on set shaft 5-by the means of which and its contiguous mechanism motion is imparted to set shaft 5.

13Vindicates a double orreversible pawl yieldingly secured to lever 12. Said pawl is held in engagement with the teeth formed upon the wheel 14 by means of a spiral spring 15.

Wheel 14 is rigidly-secured to set shaft 5, and when said wheel is rotated orrevolved consequently its motion is connected or imparted to said set shaft.

16 indicates a drum, which drum is provided on one of its edges with a graduated scale as desired and also throughout its width with a series of perforations in which the hook portion ofpawl 8 is adapted to engage. Said perforations are arranged around the circumference of saiddrum ina series and in parallel lines. The perforations of the first line on the right as shown in the drawings-Fig. 1,are closer together than those of the adjacent lines which are arranged across the entire Width of the drum.

By means of the graduated scale formed on the drum, and the perforations formed therein and suitable locking mechanism, the width of the planks is adjusted.

17 indicates a pointer located on the frame 6 on the opposite side of the drum to which the scale is secured. By means of this pointer and scale the extent to which it is desired to rotate the drum can be readily determined by the operator casting his eye across the drum.

18 indicates alug formed onthe exterior surface of the drum against which pointer 17 isfadapted to strike thereby preventing said drum from turning more than one revolution, and keeping the knee-guides from running out of their proper guides and coming in contact with the saw if advanced upon the same.

19, indicates a volute spring which is located.

on the inside of drum 16 and one end of said spring is rigidly and substantially secured to set shaft 5 and the other end thereof is likewise secured to the drum. The object of this spring is to rotate the drum backward and consequently recede the set works. The opposite end of drum 16, or the end opposite to the one in which spring 19 is located is provided on its inner periphery or circumference with a series of cogs 20, which cogs are adapted to mesh with the cogs formed in the pinion 21 mounted on a stud 23, formed on the head of the drum 16. The cogs of said pinion 21 are adapted to mesh with the cogs of a similar pinion 22, which pinion is rigidly secured to set shaft.

Having fully described myinvention I will now proceed to describe its operation.

\Vhen the operator desires to advance the knee-blocks 3 he bears or presses down upon lever 12, and brings it into sufficient contact with arm 10 to trip or disengage dog 8. After he has effected this disengagement by an upward movement of the lever or elevation of the same in which operation pawl 13 engages in the cogs of wheel 14, he thereby imparts motion to said wheel, and said Wheel being rigidly secured to set shaft 5, will impart motion to said shaft, and said shaft will communicate its motion to pinions 4, and pinions 4 will impart their forward motion to kneeblocks 3 and consequently said knee-blocks will push the log forward. Said set shaft also imparts its motion to pinion 22 which is rigidly secured thereon, and said pinion 22 imparts its motion to pinion 21, and pinion 21 imparts its motion to drum 16. When said drum has been rotated to the extent desired by the operator, which he can readily perceive by pointer 17 the dog 8 automatically engages with certain of the perforations formed in said drum. Of course this forward motion of the knee-blocks can be repeated and carried as far as the dimensions of the mechanism will permit. However, when it is desired to recede the knee-blocks or move them backward, dog 8 is disengaged by pressing down on arm 10, and the elasticity of the volute spring 19 will rotate the drum and consequently the shaft, and furthermore, the knee-blocks in a backward direction without the aid of any other mechanism to effect the backward motion of the knee-blocks. The lug 18 secured to the external surface of drum 16 will prevent said drum from making more than one revolution thereby preventing the running off of the knee-blocks as hereinbefore stated, and in the reverse motion of said drum, or the motion imparted by the elasticity of spring 19, will prevent the blocks from running off in a backward direction, or to be more explicit, the perimeter of drum 16 is ap proximately of the same length as the base of the knee-blocks 3.

Having fully described my invention, what I claim is- 1. The combination with knee blocks of a shaft carrying pinions engaging therewith, a drum having a perforated periphery loosely mounted upon the said shaft, but revolved thereby, a dog adapted to engage the perforations in the said drum, means for rotating the said shaft, and a spring contained within the drum and around the shaft for rotating the latter in the opposite direction, substantially as described.

2. The combination with knee blocks, of a shaft carrying pinions engaging therewith, a headed drum loosely mounted upon the said shaft and having a perforated periphery and internal cog teeth, a spring adapted to rotate the said cylinder in one direction a pinion upon the said shaft opposite the said teeth, and a pinion mounted upon the head of the drum and gearing with the said teeth and with the opposite pinion upon the shaft and a spring actuated dog adapted to engage in the perforations in the said drum, substantially as described.

3. The combination with knee blocks, of a shaft carrying pinions engaging therewith, a headed drum loosely mounted upon the shaft and having a perforated periphery and internal cog teeth, a pinion upon the said shaft opposite the said teeth, a pinion mounted upon the head of the drum and gearing with the said teeth and with the opposite pinion upon the shaft, a spring actuated dog adapted to engage in the perforations in the said drum, means for rotating the shaft, and a spring contained within the drum and around the shaft for rotating the latter in the opposite direction, substantially as described.

In testimony whereof I alfix my signature inpresence of two witnesses.

ALGERNON S. PETTIOREW.

Vitnesses:

E. E. LONGAN, H. C. JOHNSON. 

